Diamonds radiogenic isotopes

Pearson D. G. and Shirey S. B. (1999) Isotopic dating of diamonds. In Application of Radiogenic isotopes to Ore Deposit Research and Exploration (eds. D. D. Lambert and Ruiz J.). Society of Economic Geologists, Boulder, vol. 12, pp. 143-172. 

The ages of diamonds have been determined from data for radiogenic isotopes... 

Fig. 2.57. Pb isotopic compositions in volcanogenic Cu sulfide deposits in Japan. Diamond shape K], K2 and K3 indicate average values of Kuroko-type deposits Ki Taro (Cretaceous) K2 Northeast Japan (Miocene) K3 southwest Japan (Miocene). Note that the Shimokawa ores (solid square, Besshi subtype) and Yanahara ores (open square, Hitachi subtype), closely associated with sediments, tend to have slightly more radiogenic values than the others (solid circles) (Sato and Kase, 1996).

For example, terrestrial Xe has typically been modeled as starting with a primordial U-Xe composition (very similar to solar wind Xe), and then experiencing (a) isotopic fractionation, (b) addition of radiogenic Xe, and (c) addition of heavy Xe isotopes derived from fission of (Pepin 2000). Martian Xe doesn t quite work that way. Swindle et al. (1986) first pointed out that U-Xe (Pepin 2000) will not work as the primordial Martian Xe. Instead, they found that except for an enrichment of radiogenic Xe, Martian atmospheric Xe could be modeled as isotopically fractionated AVCC Xe (at the time considered a primitive component, now considered a mixture of Q-Xe and Xe from presolar diamonds (Ott 2002, this volume)). In that model there would be no need for any " " Pu fission Xe. In fact, there would be no room for any. This would be strange because " " Pu has a longer half-life than the I would decay away first, yet... 

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